TWI413111B - Method and apparatus for elimination noise background noise (2) - Google Patents
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本發明係一種語音背景雜訊的消除方法和裝置(二)，尤指一種應用於語音通信所屬技術領域者。The invention relates to a method and a device for eliminating speech background noise (2), in particular to a technical field to which voice communication belongs.
按目前習知之語音通信領域，由於通話者所處的環境較為複雜，導致音頻設備採集的音頻信號除了包括通話者的語音信號外，還包括周遭環境其他聲源發出的雜訊信號，如其他人的說話聲、交通工具發出的聲音等，這些雜訊信號嚴重的干擾了語音通信的質量，因此在保持高效去噪的同時，使用較少的器件去除語音信號中混雜的雜訊信號的技術已成為眾多公司關注的焦點。According to the conventional voice communication field, due to the complicated environment of the caller, the audio signal collected by the audio device includes not only the voice signal of the caller but also the noise signal sent by other sound sources in the surrounding environment, such as other people. The sound of the voice, the sound of the vehicle, etc., these noise signals seriously interfere with the quality of the voice communication, so while maintaining efficient denoising, the technology of using fewer devices to remove the mixed noise signals in the voice signal has been Become the focus of many companies.
傳統的去噪模式通常是在系統中設定一個雜訊門限，系統根據輸入信號的有效值在雜訊門限以上識別為語音，以下識別為雜訊。對雜訊做完全消除處理，語音做放大處理。實際情況下，語音開始和結束時，在雜訊門限以下存在部分的語音信號，上述的處理過程使得有效的語音信號損失一部分，從而不能保證語音的連續性，處理雜訊的過程中引入新的突變雜訊，保真度較低。而且在雜訊強度起伏較大的情況下，這種去噪模式不能保證對雜訊的有效抑制。The traditional denoising mode usually sets a noise threshold in the system. The system recognizes the voice as the voice based on the effective value of the input signal above the noise threshold. The following is identified as noise. The noise is completely eliminated, and the voice is amplified. In actual situations, when the voice starts and ends, there is a part of the voice signal below the noise threshold. The above process makes a part of the effective voice signal lose, so that the continuity of the voice cannot be guaranteed, and a new process is introduced in the process of processing the noise. Mutant noise, low fidelity. Moreover, in the case where the noise intensity fluctuates greatly, this denoising mode cannot guarantee effective suppression of noise.
本發明有鑑於習知存在的語音背景雜訊消除方法不能保證語音的連續性，處理雜訊的過程中引入新的突變雜訊，保真度較低之問題。The present invention has a problem that the conventional background noise cancellation method cannot guarantee the continuity of speech, introduces new mutation noise in the process of processing noise, and has low fidelity.
為解決現有技術中存在的問題，本發明公開了一種語音背景雜訊的消除方法，包括下述步驟︰In order to solve the problems existing in the prior art, the present invention discloses a method for canceling speech background noise, including the following steps:
A、對外部音頻電壓信號進行特徵值檢測，以得到反映外部音頻電壓信號變化趨勢的電壓特徵信號；A. Perform eigenvalue detection on the external audio voltage signal to obtain a voltage characteristic signal reflecting a change trend of the external audio voltage signal;
B、將所述電壓特徵信號與所述外部音頻電壓信號相乘，以得到乘積信號；B. Multiplying the voltage characteristic signal by the external audio voltage signal to obtain a product signal;
C、將所述乘積信號進行比例放大處理並輸出。C. Proportional amplification processing and output of the product signal.
優選地，在步驟B之前，還包括將所述電壓特徵信號進行峰值抑制處理的步驟；在步驟B時，將經過峰值抑制處理後的電壓特徵信號與所述外部音頻電壓信號相乘，以得到乘積信號。Preferably, before step B, further comprising the step of performing peak suppression processing on the voltage characteristic signal; and in step B, multiplying the voltage characteristic signal subjected to peak suppression processing by the external audio voltage signal to obtain Product signal.
優選地，所述外部音頻電壓信號為經過預放大處理的外部音頻電壓信號。Preferably, the external audio voltage signal is a pre-amplified external audio voltage signal.
優選地，實現步驟A的具體方法為︰對所述外部音頻電壓信號進行有效值檢測，以得到音頻電壓信號的平均功率信號；所述乘積信號為平均功率信號與外部音頻電壓信號的乘積。Preferably, the specific method of implementing step A is: performing RMS detection on the external audio voltage signal to obtain an average power signal of the audio voltage signal; the product signal is a product of an average power signal and an external audio voltage signal.
優選地，實現步驟A的具體方法為︰對所述外部音頻電壓信號進行峰值檢測，以得到反映信號峰值變化趨勢的峰值變化信號；所述乘積信號為峰值變化信號與外部音頻電壓信號的乘積。Preferably, the specific method of implementing step A is: performing peak detection on the external audio voltage signal to obtain a peak change signal reflecting a trend of peak signal variation; the product signal is a product of a peak change signal and an external audio voltage signal.
為解決現有技術中存在的問題，本發明還公開了一種語音背景雜訊的消除裝置，包括︰In order to solve the problems existing in the prior art, the present invention also discloses a device for canceling speech background noise, including:
特徵值檢測單元，用以接收外部音頻電壓信號並且對接收到的外部音頻電壓信號進行特徵值檢測，以得到反映外部音頻電壓信號變化趨勢的電壓特徵信號並輸出；The eigenvalue detecting unit is configured to receive an external audio voltage signal and perform eigenvalue detection on the received external audio voltage signal to obtain a voltage characteristic signal reflecting a change trend of the external audio voltage signal and output the signal;
乘法單元用以將所述電壓特徵信號與外部音頻電壓信號作乘法處理，以得到電壓特徵信號與外部音頻電壓信號的乘積信號並輸出；The multiplication unit is configured to multiply the voltage characteristic signal and the external audio voltage signal to obtain a product signal of the voltage characteristic signal and the external audio voltage signal and output the signal;
比例放大單元，用以將乘積信號進行比例放大處理並輸出。A proportional amplification unit for performing a proportional amplification process on the product signal and outputting.
優選地，所述的語音背景雜訊的消除裝置，還包括峰值抑制單元，用以接收電壓特徵信號，並將所述電壓特徵信號進行峰值抑制處理並輸出；乘法單元將經過峰值抑制處理後的電壓特徵信號與外部音頻信號作乘法處理。Preferably, the apparatus for canceling speech background noise further includes a peak suppression unit for receiving a voltage characteristic signal, and performing peak suppression processing on the voltage characteristic signal and outputting; the multiplication unit is subjected to peak suppression processing. The voltage characteristic signal is multiplied with the external audio signal.
優選地，所述外部音頻電壓信號為經過預放大處理的外部音頻電壓信號。Preferably, the external audio voltage signal is a pre-amplified external audio voltage signal.
優選地，所述特徵值檢測單元為有效值檢測單元，用以對所述外部音頻電壓信號進行有效值檢測，以得到音頻電壓信號的平均功率信號，所述乘積信號為平均功率信號與外部音頻電壓信號的乘積。Preferably, the feature value detecting unit is an effective value detecting unit configured to perform effective value detection on the external audio voltage signal to obtain an average power signal of the audio voltage signal, where the product signal is an average power signal and an external audio. The product of the voltage signal.
優選地，所述特徵值檢測單元為峰值檢測單元，用以對所述外部音頻電壓信號進行峰值檢測，以得到反映信號峰值變化趨勢的峰值變化信號，所述乘積信號為峰值變化信號與外部音頻電壓信號的乘積。Preferably, the feature value detecting unit is a peak detecting unit configured to perform peak detection on the external audio voltage signal to obtain a peak change signal reflecting a peak trend of the signal, the product signal being a peak change signal and external audio. The product of the voltage signal.
本發明透過對外部音頻電壓信號進行特徵值檢測，並將獲得的反映外部音頻電壓信號變化趨勢的電壓特徵信號與外部音頻電壓信號相乘，使語音信號和雜訊信號有了較大的分離，然後將獲得的信號進行比例放大處理能夠有效地去除環境雜訊，並對語音信號進行有效增強。The invention performs the feature value detection on the external audio voltage signal, and multiplies the obtained voltage characteristic signal reflecting the change trend of the external audio voltage signal with the external audio voltage signal, so that the voice signal and the noise signal are largely separated. Then, the obtained signal is scaled up to effectively remove environmental noise and effectively enhance the speech signal.
為了使本發明的目的、技術方案及優點更加清楚明白，以下結合附圖及實施例，對本發明進行進一步詳細說明。應當理解，此處所描述的具體實施例僅僅用以解釋本發明，並不用於限定本發明。The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
實施例一︰Embodiment 1:
第一圖是本發明實施例提供的語音背景雜訊的消除方法的實現流程圖；如第一圖所示，本發明實施例所提供的一種語音背景雜訊的消除方法，包括下述步驟︰The first figure is a flowchart for implementing a method for canceling speech background noise according to an embodiment of the present invention. As shown in the first figure, a method for canceling speech background noise according to an embodiment of the present invention includes the following steps:
A、對外部音頻電壓信號進行特徵值檢測，以得到反映外部音頻電壓信號變化趨勢的電壓特徵信號；A. Perform eigenvalue detection on the external audio voltage signal to obtain a voltage characteristic signal reflecting a change trend of the external audio voltage signal;
B、將所述電壓特徵信號與所述外部音頻電壓信號相乘，以得到乘積信號；外部音頻電壓信號經過特徵值檢測處理後，其中的語音信號對應較大的特徵值信號，雜訊信號對應較小的特徵值信號，在電壓特徵信號與所述外部音頻電壓信號相乘的過程中，語音信號與其特徵值相乘的結果比雜訊信號與其特徵值相乘得到的結果要大，並且語音信號越大得到的相乘結果就越大，雜訊信號越小得到的相乘結果就越小。在這一過程後，語音和雜訊在乘法過程的結果對比上有著量的差距，而且這種差距是比原始信號中語音和雜訊的量的對比差距要更大。這一過程本質上將語音和雜訊作更大程度的分離。B. Multiplying the voltage characteristic signal and the external audio voltage signal to obtain a product signal; after the external audio voltage signal is processed by the eigenvalue detection, the voice signal corresponds to a large eigenvalue signal, and the noise signal corresponds to a smaller eigenvalue signal, in the process of multiplying the voltage characteristic signal by the external audio voltage signal, the result of multiplying the speech signal by its eigenvalue is greater than the result of multiplying the noise signal by its eigenvalue, and the speech is The larger the signal, the larger the multiplication result, and the smaller the noise signal, the smaller the multiplication result. After this process, there is a quantitative difference in the comparison of the results of the multiplication process between speech and noise, and this difference is greater than the contrast between the amount of speech and noise in the original signal. This process essentially separates speech and noise to a greater degree.
C、將所述乘積信號進行比例放大處理並輸出。C. Proportional amplification processing and output of the product signal.
上述外部音頻電壓信號可以是採集到的外部音頻信號，也可以是從其他設備傳輸過來的音頻信號；為提升後級電路的處理精度，上述的外部音頻電壓信號為經過預放大處理的外部音頻電壓信號；在步驟B之前，還可包括將所述電壓特徵信號進行峰值抑制處理的步驟；在步驟B時，將經過峰值抑制處理後的電壓特徵信號與所述外部音頻電壓信號相乘，以得到乘積信號。峰值抑制處理使電壓特徵信號在乘法過程中，在一定範圍內與一固定值相乘，對信號作同比例放大處理，在一定程度上減小信號因不等比放大造成的失真。該抑制功能能夠起到對語音信號的放大倍數控制在一定的範圍內，可以避免輸出信號過大。The external audio voltage signal may be an external audio signal collected or an audio signal transmitted from another device; to improve the processing precision of the latter circuit, the external audio voltage signal is a pre-amplified external audio voltage. a signal; before the step B, a step of performing a peak suppression process on the voltage characteristic signal; and in step B, multiplying the voltage characteristic signal subjected to the peak suppression process by the external audio voltage signal to obtain Product signal. The peak suppression process multiplies the voltage characteristic signal by a fixed value within a certain range during the multiplication process, and performs proportional amplification processing on the signal to reduce the distortion caused by the unequal amplification. The suppression function can control the amplification factor of the speech signal within a certain range, and can avoid the output signal from being too large.
實施例二︰Embodiment 2:
實施例二與實施例一的區別在於︰The difference between the second embodiment and the first embodiment is:
步驟A具體為︰對外部音頻電壓信號進行特徵值檢測的具體方法可以為︰對所述外部音頻電壓信號進行有效值檢測，以得到音頻電壓信號的平均功率信號；Step A is specifically: the specific method for performing eigenvalue detection on the external audio voltage signal may be: performing RMS detection on the external audio voltage signal to obtain an average power signal of the audio voltage signal;
步驟B具體為︰將平均功率信號與外部音頻電壓信號相乘，以得到第一乘積信號；Step B is specifically: multiplying the average power signal by the external audio voltage signal to obtain a first product signal;
步驟C具體為︰將第一乘積信號進行比例放大處理並輸出，在本實施例子中，比例放大的倍數根據預放大處理的放大倍數和對雜訊信號的衰減程度而定，一般設計為小於1的倍數。Step C is specifically: the first product signal is subjected to proportional amplification processing and output. In the present embodiment, the multiple of the proportional amplification is determined according to the amplification factor of the pre-amplification process and the attenuation degree of the noise signal, and is generally designed to be less than 1 Multiples.
實施例三︰Embodiment 3:
實施例三與實施例一的區別在於︰The difference between the third embodiment and the first embodiment lies in:
步驟A具體為︰對外部音頻電壓信號進行特徵值檢測的具體方法可以為︰對所述外部音頻電壓信號進行峰值檢測，以得到反映信號峰值變化趨勢的峰值變化信號；Step A is specifically: the specific method for performing eigenvalue detection on the external audio voltage signal may be: performing peak detection on the external audio voltage signal to obtain a peak change signal reflecting a trend of peak signal variation;
步驟B具體為︰將峰值變化信號與外部音頻電壓信號相乘，以得到第二乘積信號；Step B is specifically: multiplying the peak change signal by the external audio voltage signal to obtain a second product signal;
步驟C具體為︰將第二乘積信號進行比例放大處理並輸出，在本實施例子中，比例放大的倍數根據預放大處理的放大倍數和對雜訊信號的衰減程度而定，一般設計為小於1的倍數。Step C is specifically: the second product signal is subjected to proportional amplification processing and output. In the present embodiment, the multiple of the proportional amplification is determined according to the amplification factor of the pre-amplification process and the attenuation degree of the noise signal, and is generally designed to be less than 1 Multiples.
實施例四︰Embodiment 4:
本發明實施例四為一種語音背景雜訊的消除裝置，第二圖是本發明實施例提供的語音背景雜訊的消除裝置的架構框圖；如第二圖所示︰一種語音背景雜訊的消除裝置，包括︰The fourth embodiment of the present invention is a device for canceling a voice background noise, and the second diagram is a block diagram of a device for canceling a voice background noise according to an embodiment of the present invention; as shown in the second figure: a voice background noise Elimination device, including:
特徵值檢測單元，用以接收外部音頻電壓信號並且對接收到的外部音頻電壓信號進行特徵值檢測，以得到反映外部音頻電壓信號變化趨勢的電壓特徵信號並輸出；The eigenvalue detecting unit is configured to receive an external audio voltage signal and perform eigenvalue detection on the received external audio voltage signal to obtain a voltage characteristic signal reflecting a change trend of the external audio voltage signal and output the signal;
乘法單元，用以將所述電壓特徵信號與外部音頻電壓信號作乘法處理，以得到電壓特徵信號與外部音頻電壓信號的乘積信號並輸出；a multiplication unit for multiplying the voltage characteristic signal and the external audio voltage signal to obtain a product signal of the voltage characteristic signal and the external audio voltage signal and outputting;
比例放大單元，用以將乘積信號進行比例放大處理並輸出。A proportional amplification unit for performing a proportional amplification process on the product signal and outputting.
實施例五︰Embodiment 5:
第三圖為本發明實施例五的電路原理圖；實施例五為對實施例四的進一步改進，如第三圖所示︰一種語音背景雜訊的消除裝置，包括信號預放大單元、特徵值檢測單元、峰值抑制單元、乘法單元和比例放大單元。信號預放大單元的輸入端與音頻採集單元的輸出端相連，特徵值檢測單元的輸入端與預放大處理單元的輸出端相連，預放大處理單元的輸出端還與乘法單元的第一輸入端相連，特徵值檢測單元的輸出端與峰值抑制單元的輸入端相連，乘法單元的第二輸入端與預放大處理單元的輸出端相連，乘法單元的輸出端與比例放大單元的輸入端相連；其中的特徵值檢測單元可以為有效值檢測單元，也可以為峰值檢測單元。3 is a circuit schematic diagram of Embodiment 5 of the present invention; Embodiment 5 is a further improvement of Embodiment 4, as shown in FIG. 3: a device for canceling speech background noise, including signal pre-amplification unit, eigenvalue A detection unit, a peak suppression unit, a multiplication unit, and a proportional amplification unit. The input end of the signal pre-amplification unit is connected to the output end of the audio collection unit, the input end of the characteristic value detection unit is connected to the output end of the pre-amplification processing unit, and the output end of the pre-amplification processing unit is also connected to the first input end of the multiplication unit The output end of the eigenvalue detecting unit is connected to the input end of the peak suppressing unit, the second input end of the multiplying unit is connected to the output end of the preamplifying processing unit, and the output end of the multiplying unit is connected to the input end of the proportional amplifying unit; The feature value detecting unit may be an effective value detecting unit or a peak detecting unit.
其具體工作過程為︰音頻採集單元將採集到的語音信號轉變為外部音頻電壓信號並輸出至信號預放大單元進行放大處理，信號預放大單元將放大後的外部音頻電壓信號分別輸出至乘法單元的第一輸入端和特徵值檢測單元的輸入端；特徵值檢測單元對經過放大處理的外部音頻電壓信號進行特徵值檢測，得到反映外部音頻電壓信號變化趨勢的電壓特徵信號並輸出至乘法單元的第二輸入端；乘法單元將電壓特徵信號和放大後的外部音頻特徵信號作相乘處理，得到乘積信號並輸出；比例放大單元將乘積信號做比例放大處理並輸出。The specific working process is: the audio collecting unit converts the collected voice signal into an external audio voltage signal and outputs the signal to the signal pre-amplifying unit for amplification processing, and the signal pre-amplifying unit outputs the amplified external audio voltage signal to the multiplication unit respectively. a first input end and an input end of the eigenvalue detecting unit; the eigenvalue detecting unit performs eigenvalue detection on the amplified external audio voltage signal, obtains a voltage characteristic signal reflecting a change trend of the external audio voltage signal, and outputs the signal to the multiplication unit a two-input terminal; the multiplication unit multiplies the voltage characteristic signal and the amplified external audio feature signal to obtain a product signal and outputs the same; the proportional amplification unit scales and outputs the product signal.
實施例五中的信號預放大單元和峰值抑制單元均為可選單元，即在對雜訊處理要求不嚴格的場合，可以不使用信號預放大單元和峰值抑制單元。The signal pre-amplification unit and the peak suppression unit in the fifth embodiment are all optional units, that is, in the case where the noise processing requirements are not strict, the signal pre-amplification unit and the peak suppression unit may not be used.
第四圖為本實施例所使用的信號採集單元的電路圖，如第四圖所示，本實施例子所使用的信號採集單元包括偏置電阻R1、麥克風1a，隔直電容C1、電阻R2、電阻R3和運算放大器U1；VCM為系統共模電平；其中R2、R3和U1構成跟隨器。麥克風1a採集到的信號經過隔直電容C1去掉偏置電壓形成交流信號，再經過R2、R3和U1組成的跟隨器進行跟隨輸出，輸出信號為外部音頻電壓信號。The fourth figure is a circuit diagram of the signal acquisition unit used in the embodiment. As shown in the fourth figure, the signal acquisition unit used in the embodiment includes a bias resistor R1, a microphone 1a, a DC blocking capacitor C1, a resistor R2, and a resistor. R3 and operational amplifier U1; VCM is the system common mode level; where R2, R3 and U1 form a follower. The signal collected by the microphone 1a is removed by the blocking capacitor C1 to form an AC signal, and then followed by a follower composed of R2, R3 and U1, and the output signal is an external audio voltage signal.
第五圖為本發明實施例提供的信號預放大單元的電路原理圖；信號預放大單元主要由電阻R4、電阻R5和運算放大器U2組成。在本發明實例中，將接收到的外部音頻電壓輸出信號進行一定倍數（一般進行4~5倍）的放大，以得到放大後的外部音頻電壓信號，該放大過程主要為運算放大器實現，放大的倍數參與了整體系統功能的實現，同時將信號放大也有利於提升後級電路的處理精度。The fifth figure is a circuit schematic diagram of a signal pre-amplification unit according to an embodiment of the present invention; the signal pre-amplification unit is mainly composed of a resistor R4, a resistor R5, and an operational amplifier U2. In the example of the present invention, the received external audio voltage output signal Amplify a certain multiple (generally 4 to 5 times) to obtain an amplified external audio voltage signal The amplification process is mainly realized by an operational amplifier, and the multiple of amplification participates in the realization of the overall system function, and the amplification of the signal is also beneficial to improve the processing precision of the latter circuit.
第六圖是本發明實施例提供的有效值檢測單元或峰值檢測單元的電路框圖；有效值檢測單元或峰值檢測單元由全波整流電路(Full Wave Rectifier，FWR)和濾波電容C2組成。有效值檢測單元或峰值檢測單元接收放大後的外部音頻電壓信號經過內部的全波整流電路的整流作用和電容的濾波作用，提取放大後的外部音頻電壓信號的平均功率信號或者放大後的外部音頻電壓信號的峰值變化信號並輸出。The sixth figure is a circuit block diagram of the RMS detecting unit or the peak detecting unit provided by the embodiment of the present invention; the RMS detecting unit or the peak detecting unit is composed of a Full Wave Rectifier (FWR) and a filter capacitor C2. The valid value detecting unit or the peak detecting unit receives the amplified external audio voltage signal Extracting the amplified external audio voltage signal through the rectification of the internal full-wave rectification circuit and the filtering of the capacitor Average power signal or peak change signal of the amplified external audio voltage signal And output.
第七圖為本發明實施例提供的峰值抑制單元的電路原理圖；如第七圖所示，峰值抑制單元包括比較器U3，比較器U3的正輸入端接收放大後的外部音頻電壓信號的平均功率信號或放大後的外部音頻電壓信號的峰值變化信號，比較器U3的負輸入端與系統中預設的峰值抑制電平VF相連；峰值抑制處理的具體過程為︰比較器U3將放大後的外部音頻電壓信號的平均功率信號或放大後的外部音頻電壓信號的峰值變化信號與系統中預設的峰值抑制電平VF比較，當信號大於VF時，比較器的輸出控制選擇開關S1選擇VF輸出，反之，選擇該信號輸出，起到對該信號進行峰值抑制的功能，使信號在乘法過程中，在一定範圍內與一固定值相乘，對信號作同比例放大處理，在一定程度上減小信號因不等比放大造成的失真。該抑制功能能夠起到對語音信號的放大倍數控制在一定的範圍內，可以避免輸出信號過大。The seventh figure is a circuit schematic diagram of a peak suppression unit according to an embodiment of the present invention; as shown in the seventh figure, the peak suppression unit includes a comparator U3, and the positive input terminal of the comparator U3 receives an average of the amplified external audio voltage signal. Peak signal of the power signal or amplified external audio voltage signal The negative input terminal of the comparator U3 is connected to the preset peak suppression level VF in the system; the specific process of the peak suppression processing is: the average power signal of the amplified external audio voltage signal by the comparator U3 or the amplified external audio Peak signal of voltage signal Compared with the preset peak suppression level VF in the system, when the signal is greater than VF, the output of the comparator controls the selection switch S1 to select the VF output, and vice versa, selects the signal output to perform the function of peak suppression of the signal, so that During the multiplication process, the signal is multiplied by a fixed value within a certain range, and the signal is scaled up to reduce the distortion caused by the unequal amplification. The suppression function can control the amplification factor of the speech signal within a certain range, and can avoid the output signal from being too large.
第八圖是本發明實施例提供的乘法單元的電路框圖；如第八圖所示，乘法單元包括乘法器U4，以實現乘法功能。乘法器的第一輸入端與預放大處理單元的輸出端相連，乘法器的第二輸入端與峰值抑制單元的輸出端相連；乘法器U4相乘公式為Z=K*X*Y(X、Y為乘法的兩路輸入，K為乘法運算的固有系數，Z為乘積信號)；其中X為經過預放大處理的外部音頻電壓信號，Y為放大後的外部音頻電壓信號的平均功率信號或放大後的外部音頻電壓信號的峰值變化信號；乘法器輸出的信號Z即為乘積信號。The eighth figure is a circuit block diagram of the multiplication unit provided by the embodiment of the present invention; as shown in the eighth figure, the multiplication unit includes a multiplier U4 to implement a multiplication function. The first input of the multiplier is connected to the output of the preamplification processing unit, and the second input of the multiplier is connected to the output of the peak suppression unit; the multiplication formula of the multiplier U4 is Z=K*X*Y (X, Y is the two inputs of multiplication, K is the intrinsic coefficient of the multiplication operation, Z is the product signal); where X is the preamplified external audio voltage signal , Y is the average power signal of the amplified external audio voltage signal or the amplified external audio voltage signal Peak change signal The signal Z output by the multiplier is the product signal .
第九圖為本發明實施例比例放大單元的電路原理圖；如第九圖所示，比例放大單元包括運放U5，電阻R7、R8和可調電阻R6，開關S2，運放U5的正輸入端接系統共模電平VCM，乘積信號由運放U5的負輸入端接入。MC為模式選擇信號，使用時根據通訊環境雜訊的強度，透過指令控制MC端口來選擇合適的降噪模式，在某些實施例中MC也可以為人工控制；一般降噪模式情況下，MC控制S2斷開，實現的比例系數為a1=(R7+R8)/R6。強降噪模式情況下，MC控制S2閉合，實現的比例系數為a2=R7/R6。可以根據實際情況，設定合適的電阻R8，來實現兩種模式降噪強度的差距。在特徵值檢測單元對語音和雜訊進行了有效的分離後，在該比例放大單元中透過設定比例系數a來要確定輸出信號相對於原始輸入信號放大和縮小的分界點，高於該分界點的信號經過系統後呈放大狀態，低於該分界點的信號經過系統後呈縮小狀態。並且原始信號幅值距離分界點越遠，其被放大或者縮小的程度就越強。分界點的設定要根據雜訊被衰減的程度和語音被增強的程度來定。透過步驟E中對語音和雜訊的分離，設定比例系數a比較容易使雜訊普遍處於比較強的衰減狀態，而有效的語音信號則普遍處於等比或者放大狀態，達到了消除雜訊，增強語音的功能。Figure 9 is a circuit schematic diagram of a proportional amplifying unit according to an embodiment of the present invention; as shown in the ninth figure, the proportional amplifying unit includes an operational amplifier U5, resistors R7, R8 and an adjustable resistor R6, a switch S2, and a positive input of the operational amplifier U5. Termination system common mode level VCM, product signal Accessed by the negative input of the op amp U5. The MC is a mode selection signal. In use, according to the strength of the communication environment noise, the MC port is controlled by the command to select an appropriate noise reduction mode. In some embodiments, the MC can also be manually controlled; in the case of the general noise reduction mode, the MC Control S2 is disconnected, and the achieved scale factor is a1=(R7+R8)/R6. In the case of strong noise reduction mode, the MC control S2 is closed, and the achieved proportional coefficient is a2=R7/R6. According to the actual situation, the appropriate resistance R8 can be set to achieve the difference between the noise reduction strengths of the two modes. After the feature value detecting unit effectively separates the voice and the noise, the dividing factor is determined by setting the proportional coefficient a in the proportional amplifying unit to determine a boundary point at which the output signal is enlarged and reduced relative to the original input signal, which is higher than the dividing point. The signal is amplified after passing through the system, and the signal below the demarcation point is reduced after passing through the system. And the farther the original signal amplitude is from the demarcation point, the more it is amplified or reduced. The setting of the demarcation point is determined by the degree to which the noise is attenuated and the degree to which the speech is enhanced. Through the separation of speech and noise in step E, setting the proportional coefficient a is relatively easy to make the noise generally in a relatively strong attenuation state, and the effective speech signal is generally in the equal ratio or amplification state, achieving the elimination of noise and enhancement. Voice function.
綜上所述，本創作確實可達到上述諸項功能及目的，故本創作應符合專利申請要件，爰依法提出申請。In summary, this creation can indeed achieve the above functions and purposes, so this creation should meet the requirements of the patent application, and apply in accordance with the law.
無no
第一圖係本發明實施例提供的語音背景雜訊的消除方法的實現流程圖；The first figure is a flowchart for implementing a method for canceling speech background noise provided by an embodiment of the present invention;
第二圖係本發明實施例提供的語音背景雜訊的消除裝置的架構框圖；The second figure is a structural block diagram of a device for canceling speech background noise provided by an embodiment of the present invention;
第三圖係本發明實施例提供的又一語音背景雜訊的消除裝置的架構框圖；The third figure is a structural block diagram of another apparatus for canceling speech background noise provided by the embodiment of the present invention;
第四圖係本發明實施例提供的音頻採集單元的電路原理圖；The fourth figure is a circuit schematic diagram of an audio collection unit provided by an embodiment of the present invention;
第五圖係本發明實施例提供的信號預放大單元的電路原理圖；The fifth figure is a circuit schematic diagram of a signal pre-amplification unit provided by an embodiment of the present invention;
第六圖係本發明實施例提供的有效值檢測單元或峰值檢測單元的電路框圖；The sixth figure is a circuit block diagram of an effective value detecting unit or a peak detecting unit provided by an embodiment of the present invention;
第七圖係本發明實施例提供的峰值抑制單元的電路原理圖；The seventh figure is a circuit schematic diagram of a peak suppression unit provided by an embodiment of the present invention;
第八圖係本發明實施例提供的乘法單元的電路原理圖；The eighth figure is a circuit schematic diagram of the multiplication unit provided by the embodiment of the present invention;
第九圖係本發明實施例提供的比例放大單元的電路原理圖；The ninth figure is a circuit schematic diagram of a proportional amplification unit provided by an embodiment of the present invention;
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| EP1879180A1 (en) * | 2006-07-10 | 2008-01-16 | Harman Becker Automotive Systems GmbH | Reduction of background noise in hands-free systems |
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